Just to assemble the northern hemisphere required over an hour of painstaking work, about half of it punching holes and the other half carefully taping it together. The double-sided tape (included) was nearly impossible to apply without messing it up. The finished result was lame -- just a scant few stars from a handful of constellations. Most were so distorted that they were unrecognizable. Moreover, even the slightest misalignment in the dome let through light leaks. Either spend more money on a higher-quality star projector or, for about the same price, buy some glow-in-the-dark stars and use a star map to apply them to the ceiling.