Okay, let's talk mathematically.
Plot these values with Matlab or any other program, you will see any four neighbor is not square, but there is no any folding.
I don't know how can I represent it mathematically? Just imagine.
-2,32694515300473 3,19594853070491
-1,87101696920136 3,53911469495653
-1,49697278629696 3,61227250912198
-0,812252816983230 3,82792629280857
-0,147918609198309 3,98059297701020
0,390461004711642 3,99667043104063
0,884635482977476 3,89297309863322
1,41862585593114 3,70047870224348
1,94486026951645 3,50023255289683
2,12802722655400 3,46714450605330
-2,78020371562039 2,63403212350418
-2,44007013428676 2,80574834840606
-1,75678333549307 3,19965838279159
-0,957829844819876 3,52074443618457
-0,182076532574938 3,73672888103408
0,463479763231325 3,76685862271947
1,04875144705676 3,64368797569522
1,65492544449036 3,43751734766827
2,23262763908458 3,24775492497955
2,51767773494581 3,20365705804921
-3,30654229102224 1,88642168618198
-2,95278191192729 1,99444008823907
-2,19788365455637 2,46574309431344
-1,24966822756095 2,94536868995197
-0,265633271800463 3,28799511426322
0,597207217948285 3,35668546129306
1,34596147203459 3,20013782630764
2,03883795370349 2,96279092581487
2,63524227709273 2,76965009245765
2,88123924344436 2,76864007565561
-3,73936517152663 1,02535636078190
-3,41601308955823 1,03028174544308
-2,71333769969827 1,44787495862483
-1,66526705427120 1,99782862591119
-0,368847457391923 2,47078002602619
0,871982677935723 2,62255864087147
1,84741070387648 2,48772894756460
2,57551820107007 2,29019690599247
3,11979971257069 2,14443394557546
3,30805148146207 2,17321217176120
-3,87986828925710 0,0271770496135864
-3,58772154035731 -0,00312662503954026
-3,01046171586551 0,207825865034808
-1,96275315054535 0,602081400536833
-0,368816705719322 1,09075567785720
1,27415088725822 1,41223956351439
2,41365415081305 1,48523689020387
3,09840051128794 1,49096860280329
3,56457705610688 1,48740235602663
3,74265705755724 1,52559093327826
-3,64462201092694 -1,05977000468018
-3,39677180801383 -1,07874999347574
-2,86680819341489 -1,04246063928960
-1,82429254380151 -0,905207207633807
-0,137762310557508 -0,547243107469706
1,61816140521391 -0,0447171503178926
2,77046893675470 0,348089720561431
3,42133504857468 0,634060957603966
3,86215834352058 0,831019367099838
4,06834690300680 0,923189211801449
-3,21452127783302 -2,08999042183416
-2,94423661881498 -2,07231036318961
-2,32478399098324 -2,11109321057077
-1,24020627495412 -2,14979523813510
0,274664693077160 -1,95769879216913
1,78998366724822 -1,42169102006789
2,84660055164790 -0,830818492535765
3,50448492247770 -0,316371793207998
3,96566931849085 0,0937393243670031
4,19488895323155 0,313011549676092
-2,66185083527865 -2,93965170298760
-2,34969683316718 -2,86343860765161
-1,58825260901408 -2,92018735678278
-0,522260143514478 -3,00168339918477
0,667309770121411 -2,90388813729791
1,81854359021624 -2,47392564720957
2,73233702766931 -1,89533103691950
3,38234462331372 -1,31481850768917
3,86449854653031 -0,794338991109572
4,11144103769076 -0,427888632314525
-2,00539382315959 -3,55091946711407
-1,69705429505853 -3,43677093360340
-0,904915502869441 -3,46187602412137
0,0305466579334755 -3,50856800159196
0,944474687567931 -3,43616148928553
1,83575795494745 -3,10429619686752
2,63660425944077 -2,60922485106903
3,25145504193097 -2,07082755812636
3,70563437043324 -1,55718114930929
3,93288485700551 -1,13732557886813
-1,04661509519607 -4,06115243199433
-1,18470853275476 -3,74662771684467
-0,473749811791085 -3,73474467970858
0,334443810077910 -3,74919758503128
1,09949897620091 -3,67366096540719
1,85682170564657 -3,41166696348707
2,57626860496710 -2,97429585155003
3,15288140241824 -2,48699543909825
3,55848249402213 -2,00876817060237
3,68518627149908 -1,72471305201884