Basically every dimension must exist within a higher dimension.
Think of a tennis ball bouncing in front of you. Now freeze time. The ball can be placed at x,y,z position (basically). But the same ball exists at a different x,y,z if we include t for the 4th dimensional measurement. The xyz changes position as the ball bounces, but only if t changes indicating movement through 4d time.
You are mixing spatial dimensions with a temporal dimension. A 3D space does not require time. A 3D space exists in a 4D space though is “flat” in the 4th just like a 2D plane is flat in the 3rd.
A point must exist on a 1 d line.
A 1d line must exist on a 2d plane.
A 2d plane must exist in a 3d space
A 3d space must exist in a 4d time.
Basically every dimension must exist within a higher dimension.
Think of a tennis ball bouncing in front of you. Now freeze time. The ball can be placed at x,y,z position (basically). But the same ball exists at a different x,y,z if we include t for the 4th dimensional measurement. The xyz changes position as the ball bounces, but only if t changes indicating movement through 4d time.
You are mixing spatial dimensions with a temporal dimension. A 3D space does not require time. A 3D space exists in a 4D space though is “flat” in the 4th just like a 2D plane is flat in the 3rd.