EASYAwe for infinite variationCaught on coat sleeves in the cold.Patterns shaped by idle angels.Beauty that warm hands can't hold.ANSWER: SnowflakesThe awe inspired by snowflakes comes with the knowledge that each flake has its own, utterly individual pattern. One might say that the snowflakes' patterns are shaped by angels (who reside, of course, in the heavens). The snowflakes can't be held in warm hands because in the presence of warmth they quickly melt.INTERMEDIATEOld Grandpa Tall stands in the hallAnd sings his song in booming tones.While Grandson Small sits by my hand,Twittering like a cellular phone.ANSWER: A grandfather clock and a digital watchBy using the words "Grandpa and Grandson" this riddle conveys an "old and young" relationship between the two answers. The grandfather clock is an antiquarian clock that stands tall in the hallways of old houses. A digital watch rests on a person's wrist and beeps like a cellular phone.DIFFICULTMoney paid for money-like.Money-like slipped through a slot.Push the bar. Get in the car.A trip below is what you've bought.ANSWER: A trip on the subwayIn the subway station you exchange coins for a coin-like subway token. The token is slipped through a slot in the turnstile. One pushes the bar of the turnstile to pass through it. Later one enters the subway car. The subway travels below the streets.